The robot needs _______ once a month. And we will check it for you for free.
#48844
A
to check
B
checked
C
checking
D
to checking
推荐题目
When shopping, keep your eyes ______for those energy-saving machines.
#49678
A
opened
B
open
C
to open
D
to be open
We’ll do what we can ______ English well this term.
#50953
A
study
B
to study
C
be studied
D
be studying
The Hi-speed train made possible for the passengers home easilier.
#48387
A
that；to get
B
this；get
C
it；to get
D
it；getting